Cited by 2,282Neutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stressBioactive Compounds and Antitumor Agents

Myeloperoxidase: friend and foe

Klebanoff, Seymour J·2005·Journal of Leukocyte Biology

Abstract

Neutrophilic polymorphonuclear leukocytes (neutrophils) are highly specialized for their primary function, the phagocytosis and destruction of microorganisms. When coated with opsonins (generally complement and/or antibody), microorganisms bind to specific receptors on the surface of the phagocyte and invagination of the cell membrane occurs with the incorporation of the microorganism into an intracellular phagosome. There follows a burst of oxygen consumption, and much, if not all, of the extra oxygen consumed is converted to highly reactive oxygen species. In addition, the cytoplasmic granules discharge their contents into the phagosome, and death of the ingested microorganism soon follows. Among the antimicrobial systems formed in the phagosome is one consisting of myeloperoxidase (MPO), released into the phagosome during the degranulation process, hydrogen peroxide (H2O2), formed by the respiratory burst and a halide, particularly chloride. The initial product of the MPO-H2O2-chloride system is hypochlorous acid, and subsequent formation of chlorine, chloramines, hydroxyl radicals, singlet oxygen, and ozone has been proposed. These same toxic agents can be released to the outside of the cell, where they may attack normal tissue and thus contribute to the pathogenesis of disease. This review will consier the potential sources of H2O2 for the MPO-H2O2-halide system; the toxic products of the MPO system; the evidence for MPO involvement in the microbicidal activity of neutrophils; the involvement of MPO-independent antimicrobial systems; and the role of the MPO system in tissue injury. It is concluded that the MPO system plays an important role in the microbicidal activity of phagocytes.

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Crossref · 10.1189/jlb.1204697

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510 of 510 references verified0 citation errors · 0 not checkable

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  • MPO is found predominantly in neutrophils and monocytes and catalyzes the reaction of hydrogen peroxide to produce several reactive species, mainly hypochlorous acid (HOCl).

    “MPO is found predominantly in neutrophils and monocytes and catalyzes the reaction of hydrogen peroxide to produce several reactive species, mainly hypochlorous acid (HOCl) (discussed in sect. IVB) (516, 1021).”
  • MPO, lactoperoxidase, and eosinophil peroxidase are integral components of the immune defense.

    “MPO, lactoperoxidase, and eosinophil peroxidase are integral components of the immune defense (516).”
  • MPO is expressed in neutrophil granulocytes and produces hypohalous acids to carry out its antimicrobial activity.

    “The enzyme myeloperoxidase MPO is expressed in neutrophil granulocytes (a subtype of white blood cells) and produces hypohalous acids to carry out its antimicrobial activity [146].”

    From The Role of Reactive Species on Innate Immunity (2022) · cites this paper as [146]

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Authors
Klebanoff, S. J.
Affiliations
University of Washington (US)
Corresponding author
Klebanoff, Seymour J
Venue
Journal of Leukocyte Biology
Published
2005-02-02
Volume
77
Issue
5
Pages
598-625
ISSN
  • 0741-5400 (ISSN-L)
  • 1938-3673
OpenAlex
W2059149560
Cited by
2,282
References
510
Citations by year
2026: 67 · 2025: 77 · 2024: 91 · 2023: 81 · 2022: 115 · 2021: 98 · 2020: 139 · 2019: 120 · 2018: 134 · 2017: 138 · 2016: 117 · 2015: 158 · 2014: 141 · 2013: 140 · 2012: 135
FWCI
5.95
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Leukocyte Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Bioactive Compounds and Antitumor Agents
Keywords
myeloperoxidase, neutrophils, phagocytosis, respiratory burst, hydrogen peroxide, hypochlorous acid, reactive oxygen species, microbicidal activity, tissue damage
MeSH terms
Animals, Arteriosclerosis, Humans, Hydrogen Peroxide, Lung Diseases, Peroxidase, Neoplasms, Neutrophils, Phagocytosis, Respiratory Burst, Neutrophil Activation

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